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Loans - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage warehouse $ 89,360 $ 135,727    
Total loans 2,146,953 2,135,986    
Allowance for loan losses (15,054) (14,837) $ (14,236) $ (14,534)
Loans, net 2,131,899 2,121,149    
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 1,106,471 1,069,956    
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 533,646 531,874    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 417,476 398,429    
Working Capital and Equipment [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 559,733 539,403    
Real Estate Including Agriculture [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 499,009 485,620    
Tax Exempt Loans Receivable [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 16,399 15,486    
Other Commercial Loans [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 31,330 29,447    
1-4 Family [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 527,994 526,024    
Other Real Estate Loans [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 5,652 5,850    
Auto [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 188,601 174,773    
Recreation Consumer Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 7,264 5,669    
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 54,414 53,898    
Home Equity Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 147,528 144,508    
Unsecured Debt [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 3,536 3,875    
Other Consumer Loans [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total $ 16,133 $ 15,706